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Question
When SO2 is passed through an acidified solution of potassium dichromate, then chromium sulphate is formed. The change in the valency of chromium is ______.
Options
+4 to +2
+5 to +3
+6 to +3
+7 to +2
MCQ
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Solution
When SO2 is passed through an acidified solution of potassium dichromate, then chromium sulphate is formed. The change in the valency of chromium is +6 to +3.
Explanation:
\[\ce{K2Cr2O7 + 3SO2 + 4H2SO4 -> K2SO4 + Cr2(SO4)3 + 3SO3 + 4H2O}\]
The oxidation number of chromium changes from +6 to +3.
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